fix(git): graceful delta fallback when not installed

core.pager now checks for delta and falls back to less -R,
avoiding errors in environments where delta is not available.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

home/.gitconfig

@@ -18,7 +18,7 @@
 
 [core]
   autocrlf = input
-  pager = delta
+  pager = "command -v delta >/dev/null 2>&1 && delta || less -R"
 
 [interactive]
   diffFilter = delta --color-only